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Method for preparing 1-bromopropane

A technology of bromopropane and propylene, which is applied in the field of preparing 1-bromopropane, can solve the problems of high production cost and difficult price of n-propanol, achieve low production cost, overcome high production cost, and reduce equipment corrosion

Active Publication Date: 2008-12-10
TIANJIN CHANGLU HAIJING GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two kinds of production methods cause the high production cost because raw material n-propanol is not easy to get and the price is higher

Method used

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  • Method for preparing 1-bromopropane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 1 ton of 1-bromopropane base material containing 95% in the reaction equipment, open the propylene valve after 2 minutes of starting the circulation pump, the propylene amount is 274mol / h, and open the ozone machine at the same time, so that the gas output of the ozone machine is 0.6m 3 / h, the ozone content is 25ppm. After the ozone-containing gas and propylene are activated in the activation device, they enter the reaction equipment to dissolve the activated propylene in 1-bromopropane. Then open the hydrogen bromide valve after purification and drying, so that the flow rate of hydrogen bromide is 277mol / h into the reaction equipment, hydrogen bromide and activated propylene undergo free radical addition reaction, and the reaction temperature is strictly controlled by circulating water to be 35 ~38°C. After the tail gas passes through the tail gas absorption device, the unreacted hydrogen bromide gas is absorbed, and a small amount of non-condensable gas is discha...

Embodiment 2

[0025] Add 1.2 tons of 1-bromopropane bottom material containing 95% in the reaction equipment, open the propylene valve after 3 minutes of opening the circulation pump, the propylene amount is 365mol / h, open the ozone machine at the same time, make the gas output of the ozone machine be 0.6m 3 / h, the ozone content is 30ppm, after the ozone-containing gas and propylene are activated in the activation device, they enter the reaction equipment, so that the activated propylene is dissolved in 1-bromopropane. Then open the hydrogen bromide valve after purification and drying, so that the flow rate of hydrogen bromide is 372mol / h into the reaction equipment, hydrogen bromide and activated propylene undergo free radical addition reaction, and the reaction temperature is strictly controlled by circulating water to be 35 ~38°C. After the tail gas passes through the tail gas absorption device, the unreacted hydrogen bromide gas is absorbed, and a small amount of non-condensable gas is...

Embodiment 3

[0027] Add 1 ton of 1-bromopropane base material containing 95% in the reaction equipment, open the propylene valve after 2 minutes of starting the circulation pump, the propylene amount is 502mol / h, and open the ozone machine at the same time, so that the gas output of the ozone machine is 0.6m 3 / h, the ozone content is 40ppm, after the ozone-containing gas and propylene are activated in the activation device, they enter the reaction equipment, so that the activated propylene is dissolved in 1-bromopropane. Then open the hydrogen bromide valve after purification and drying, so that the flow rate of hydrogen bromide is 512mol / h into the reaction equipment, hydrogen bromide and activated propylene undergo free radical addition reaction, and the reaction temperature is strictly controlled by circulating water to be 35 ~38°C. After the tail gas passes through the tail gas absorption device, the unreacted hydrogen bromide gas is absorbed, and a small amount of non-condensable gas...

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Abstract

The invention provides a method for making 1-propyl bromide, which comprises the preprocessing of hydrogen bromide, the drying of propylene, the activation of propylene and the synthesis of 1-propyl bromide. The method is to use high-purity gaseous hydrogen bromide and polymer-grade propylene as raw materials and carry out free radical reaction under the action of air containing 20 to 50 ppm ozone to obtain a product containing more than or equal to 95 percent of 1-propyl bromide. The reaction is carried out under the water-free condition in the presence of a reductive agent. The process has the advantages of low production cost, short route, simple and convenient operation, little corrosion to equipment, environmental protection, etc.

Description

technical field [0001] The present invention relates to a method for preparing 1-bromopropane. Background technique [0002] 1-Bromopropane (also known as n-propyl bromide, n-propane bromide, n-propane bromide) is an important chemical raw material, mainly used in the manufacture of high-efficiency and low-toxicity pesticides. In recent years, with the acceleration of the development of industrial cleaning agents, 1-bromopropane is used as a substitute for ODS. Its application includes most traditional chlorocarbon solvents, HCFC-141b and HCFC-225 and some other flammable cleaning solvents. field of use. [0003] There are two traditional production processes: one is prepared by the reaction of n-propanol and hydrobromic acid under the catalysis of sulfuric acid, and the other is prepared by the reaction of n-propanol and sodium bromide. These two production methods cause high production cost because the raw material n-propanol is not easy to get and the price is high. Th...

Claims

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Application Information

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IPC IPC(8): C07C19/01C07C17/08
Inventor 张德强魏炳举李萌张金娜焦华田凤麟
Owner TIANJIN CHANGLU HAIJING GRP CO LTD
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